When I try to use the slot value as follows:
( defrule testExtern
( dependency ( externalObserver ?eo ) )
=>
( printout t ?eo crlf )
(set ?f background ( get-member java.awt.Color red ))
)
I get the following exception:
Rete Exception in routine Value::externalAddressValue while executing
defrule testExtern while executing deffunction quitButton-handler.
Message: Not an external address: ?f type = 8
Any clues?
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf Of Ernest Friedman-Hill
> Sent: Wednesday, August 26, 1998 4:09 PM
> To: [EMAIL PROTECTED]
> Subject: Re: JESS: Referencing externals
>
>
> Hi Glenn,
>
> I've been having a bit of trouble following this thread; the
> terminology is a bit non-standard. How about I show a working example
> of something, and you tell me why it's not what you want:
>
> ;----------------------------------------------------------------------
> Jess, the Java Expert System Shell
> Copyright (C) 1998 E.J. Friedman Hill and the Sandia Corporation
> Jess Version 4.1b6 8/20/98
>
> Jess> (set-reset-globals FALSE)
> FALSE
> Jess> (defglobal ?*tf* = (new java.awt.TextField))
> TRUE
> Jess> (deftemplate holder (slot field))
> TRUE
> Jess> (deffacts my-facts (holder (field ?*tf*)))
> TRUE
> Jess> (defrule test-rule
> (holder (field ?f))
> =>
> (printout t ?f crlf))
> TRUE
> Jess> (reset)
> TRUE
> Jess> (run)
> <External-Address:java.awt.TextField>
> TRUE
> Jess>
> ;----------------------------------------------------------------------
>
>
> I think Glenn Williams wrote:
> >
> > Thanks for the reply.
> >
> > > Obviously, the "?e <- (editor (field ?tf))" will only work on the
> > > LHS of a rule, allowing you to access the TextField object on the
> > > RHS via the bound value ?tf. To access externals outside of a rule,
> >
> > The problem is when I try to bind the value of the external to ?tf, the
> > pattern never match's. The following never match's, even though
> there are
> > facts which it should fire on. externalObserver is bound to an external
> > java.awt.TextField.
> >
> > ( dependency ( subject ?addressID ) ( externalObserver ?observer ) )
> >
> > I want to put external global's in facts, retrieve them, and use them.
> >
> > glenn
> >
>
> > > From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On
> > > Behalf Of Al Davis
> > >
> > > Glenn,
> > >
> > > Obviously, the "?e <- (editor (field ?tf))" will only work on the
> > > LHS of a rule, allowing you to access the TextField object on the
> > > RHS via the bound value ?tf. To access externals outside of a rule,
> > > try using the store/fetch methods or directly use your global.
> > >
> > >
> > > On Wed, 26 Aug 1998, Glenn Williams wrote:
> > >
> > > > I'd like to do the following:
> > > > ( deftemplate editor ( slot field ) )
> > > > ( defglobal ?*t* = new java.awt.textField )
> > > >
> > > > ( assert editor ( field ?*t* ) )
> > > >
> > > > This works, the reference is loaded into editor, but how do I
> > > retrieve it?
> > > >
> > > > I tried:
> > > >
> > > > ?e <- ( editor ( field ?tf ) )
> > > >
> > > > which fails.
> > > >
> > > > How do I can I get and use the external reference?
> > > >
> > > > glenn
> > > >
> > > > >
>
>
>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Distributed Systems Research Phone: (510) 294-2154
> Sandia National Labs FAX: (510) 294-2234
> Org. 8920, MS 9214 [EMAIL PROTECTED]
> PO Box 969 http://herzberg.ca.sandia.gov
> Livermore, CA 94550
>
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